Fan control:

for high-power output amplifiers

Most domestic
amplifiers are
cooled solely by
convection, but it
may happen that
a standard heat
exchanger does
not provide adequate
cooling for a certain output amplifier. In
such a case other means must be used, normally
a fan or fans. The circuit described in this
article provides a temperature-dependent, proportional
control for such a cooling fan. It
enables the turn-on threshold and the control
characteristic to be set as needed within a
given range. It also provides over-temperature
indication which may be used to actuate the
protection circuit of the amplifier.

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